#include "Nguoi.h"
#include "NguoiAnh.h"
#include "NguoiViet.h"
int main() {
	Nguoi *n;
	NguoiViet nv;
	NguoiAnh na;
	n = &nv;
	n->Chao(); // (*)
	n = &na;
	n->Chao(); // cung dong code voi (*) nhung lai cho ket qua khac
	system("pause");
		return 0;
}